Polycarboxylic acid-based high-efficiency water-reducing agents were developed after ordinary water-reducing agents represented by calcium lignosulfonate and high-efficiency water-reducing agents represented by naphthalene series. The third generation of high-performance water-reducing agent is currently a high-performance water-reducing agent with relatively high technological content, the best application prospects, and excellent overall performance. At present, the application of polycarboxylic acid-based high-performance water-reducing agents has gradually developed from key projects, large-scale projects, and special projects in the past to general industrial and civil construction projects. On the one hand, this is because the polycarboxylic acid-based high-performance aqueous agent synthesis technology and compounding technology have been improved. After compounding with retarding components, defoaming components, air-entraining components, antifreeze components, etc., it basically meets the requirements Technical requirements for the production of various concretes; On the other hand, the synthesis cost and compounding cost of polycarboxylic acid-based high-performance water-reducing agents have also been greatly reduced. After the optimized design of concrete mix proportions, the cost of concrete production has been greatly reduced, and the performance of concrete There has been some improvement. Although the application of polycarboxylic acid-based high-performance water-reducing agents is not as mature as naphthalene-based high-performance water-reducing agents, it is currently impossible to completely replace naphthalene-based high-performance water-reducing agents. Water agent, but due to its remarkable characteristics of making it easier to achieve high economy and high performance of concrete, it has gradually become the "protagonist" in the admixture industry. In the use of polycarboxylic acid-based high-performance water-reducing agents , also encountered many of the same problems as using naphthalene-based high-efficiency water-reducing admixtures. Common ones include fast slump loss, poor appearance quality, poor working performance, etc. On the one hand, this is because the quality of polycarboxylic acid-based high-performance water-reducing admixtures of various brands varies greatly. On the other hand, it is also because of environmental conditions, concrete technical requirements, the quality of other raw materials, concrete mix ratio design and construction technology. A big difference. Therefore, the use of polycarboxylic acid-based high-performance water-reducing agents, like the use of naphthalene-based high-performance water-reducing agents, also requires constant adjustments based on environmental conditions, raw materials, mix ratios, concrete technical requirements, construction techniques, etc., in order to systematically solve the problems that arise. question.
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